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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/pci/pci-driver.c | |
3 | * | |
2b937303 GKH |
4 | * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com> |
5 | * (C) Copyright 2007 Novell Inc. | |
6 | * | |
7 | * Released under the GPL v2 only. | |
8 | * | |
1da177e4 LT |
9 | */ |
10 | ||
11 | #include <linux/pci.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/device.h> | |
d42c6997 | 15 | #include <linux/mempolicy.h> |
4e57b681 TS |
16 | #include <linux/string.h> |
17 | #include <linux/slab.h> | |
8c65b4a6 | 18 | #include <linux/sched.h> |
873392ca | 19 | #include <linux/cpu.h> |
6cbf8214 | 20 | #include <linux/pm_runtime.h> |
eea3fc03 | 21 | #include <linux/suspend.h> |
4fc9bbf9 | 22 | #include <linux/kexec.h> |
1da177e4 LT |
23 | #include "pci.h" |
24 | ||
75865858 GKH |
25 | struct pci_dynid { |
26 | struct list_head node; | |
27 | struct pci_device_id id; | |
28 | }; | |
1da177e4 | 29 | |
9dba910e TH |
30 | /** |
31 | * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices | |
32 | * @drv: target pci driver | |
33 | * @vendor: PCI vendor ID | |
34 | * @device: PCI device ID | |
35 | * @subvendor: PCI subvendor ID | |
36 | * @subdevice: PCI subdevice ID | |
37 | * @class: PCI class | |
38 | * @class_mask: PCI class mask | |
39 | * @driver_data: private driver data | |
40 | * | |
41 | * Adds a new dynamic pci device ID to this driver and causes the | |
42 | * driver to probe for all devices again. @drv must have been | |
43 | * registered prior to calling this function. | |
44 | * | |
45 | * CONTEXT: | |
46 | * Does GFP_KERNEL allocation. | |
47 | * | |
48 | * RETURNS: | |
49 | * 0 on success, -errno on failure. | |
50 | */ | |
51 | int pci_add_dynid(struct pci_driver *drv, | |
52 | unsigned int vendor, unsigned int device, | |
53 | unsigned int subvendor, unsigned int subdevice, | |
54 | unsigned int class, unsigned int class_mask, | |
55 | unsigned long driver_data) | |
56 | { | |
57 | struct pci_dynid *dynid; | |
9dba910e TH |
58 | |
59 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
60 | if (!dynid) | |
61 | return -ENOMEM; | |
62 | ||
63 | dynid->id.vendor = vendor; | |
64 | dynid->id.device = device; | |
65 | dynid->id.subvendor = subvendor; | |
66 | dynid->id.subdevice = subdevice; | |
67 | dynid->id.class = class; | |
68 | dynid->id.class_mask = class_mask; | |
69 | dynid->id.driver_data = driver_data; | |
3d3c2ae1 | 70 | |
9dba910e TH |
71 | spin_lock(&drv->dynids.lock); |
72 | list_add_tail(&dynid->node, &drv->dynids.list); | |
73 | spin_unlock(&drv->dynids.lock); | |
74 | ||
3b7f1016 | 75 | return driver_attach(&drv->driver); |
9dba910e | 76 | } |
b7fe9434 | 77 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
9dba910e TH |
78 | |
79 | static void pci_free_dynids(struct pci_driver *drv) | |
80 | { | |
81 | struct pci_dynid *dynid, *n; | |
3d3c2ae1 | 82 | |
9dba910e TH |
83 | spin_lock(&drv->dynids.lock); |
84 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
85 | list_del(&dynid->node); | |
86 | kfree(dynid); | |
87 | } | |
88 | spin_unlock(&drv->dynids.lock); | |
89 | } | |
90 | ||
1da177e4 | 91 | /** |
9dba910e | 92 | * store_new_id - sysfs frontend to pci_add_dynid() |
8f7020d3 RD |
93 | * @driver: target device driver |
94 | * @buf: buffer for scanning device ID data | |
95 | * @count: input size | |
1da177e4 | 96 | * |
9dba910e | 97 | * Allow PCI IDs to be added to an existing driver via sysfs. |
1da177e4 | 98 | */ |
a9427741 | 99 | static ssize_t new_id_store(struct device_driver *driver, const char *buf, |
3c78bc61 | 100 | size_t count) |
1da177e4 | 101 | { |
1da177e4 | 102 | struct pci_driver *pdrv = to_pci_driver(driver); |
b41d6cf3 | 103 | const struct pci_device_id *ids = pdrv->id_table; |
3c78bc61 RD |
104 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
105 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
106 | unsigned long driver_data = 0; | |
107 | int fields = 0; | |
8895d3bc | 108 | int retval = 0; |
1da177e4 | 109 | |
b41d6cf3 | 110 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
1da177e4 LT |
111 | &vendor, &device, &subvendor, &subdevice, |
112 | &class, &class_mask, &driver_data); | |
6ba18636 | 113 | if (fields < 2) |
1da177e4 LT |
114 | return -EINVAL; |
115 | ||
8895d3bc BD |
116 | if (fields != 7) { |
117 | struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL); | |
118 | if (!pdev) | |
119 | return -ENOMEM; | |
120 | ||
121 | pdev->vendor = vendor; | |
122 | pdev->device = device; | |
123 | pdev->subsystem_vendor = subvendor; | |
124 | pdev->subsystem_device = subdevice; | |
125 | pdev->class = class; | |
126 | ||
127 | if (pci_match_id(pdrv->id_table, pdev)) | |
128 | retval = -EEXIST; | |
129 | ||
130 | kfree(pdev); | |
131 | ||
132 | if (retval) | |
133 | return retval; | |
134 | } | |
135 | ||
b41d6cf3 JD |
136 | /* Only accept driver_data values that match an existing id_table |
137 | entry */ | |
2debb4d2 CW |
138 | if (ids) { |
139 | retval = -EINVAL; | |
140 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
141 | if (driver_data == ids->driver_data) { | |
142 | retval = 0; | |
143 | break; | |
144 | } | |
145 | ids++; | |
b41d6cf3 | 146 | } |
2debb4d2 CW |
147 | if (retval) /* No match */ |
148 | return retval; | |
b41d6cf3 | 149 | } |
b41d6cf3 | 150 | |
9dba910e TH |
151 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
152 | class, class_mask, driver_data); | |
b19441af GKH |
153 | if (retval) |
154 | return retval; | |
1da177e4 LT |
155 | return count; |
156 | } | |
a9427741 | 157 | static DRIVER_ATTR_WO(new_id); |
1da177e4 | 158 | |
0994375e CW |
159 | /** |
160 | * store_remove_id - remove a PCI device ID from this driver | |
161 | * @driver: target device driver | |
162 | * @buf: buffer for scanning device ID data | |
163 | * @count: input size | |
164 | * | |
165 | * Removes a dynamic pci device ID to this driver. | |
166 | */ | |
a9427741 | 167 | static ssize_t remove_id_store(struct device_driver *driver, const char *buf, |
3c78bc61 | 168 | size_t count) |
0994375e CW |
169 | { |
170 | struct pci_dynid *dynid, *n; | |
171 | struct pci_driver *pdrv = to_pci_driver(driver); | |
172 | __u32 vendor, device, subvendor = PCI_ANY_ID, | |
173 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
174 | int fields = 0; | |
9222097f | 175 | size_t retval = -ENODEV; |
0994375e CW |
176 | |
177 | fields = sscanf(buf, "%x %x %x %x %x %x", | |
178 | &vendor, &device, &subvendor, &subdevice, | |
179 | &class, &class_mask); | |
180 | if (fields < 2) | |
181 | return -EINVAL; | |
182 | ||
183 | spin_lock(&pdrv->dynids.lock); | |
184 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { | |
185 | struct pci_device_id *id = &dynid->id; | |
186 | if ((id->vendor == vendor) && | |
187 | (id->device == device) && | |
188 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && | |
189 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && | |
190 | !((id->class ^ class) & class_mask)) { | |
191 | list_del(&dynid->node); | |
192 | kfree(dynid); | |
9222097f | 193 | retval = count; |
0994375e CW |
194 | break; |
195 | } | |
196 | } | |
197 | spin_unlock(&pdrv->dynids.lock); | |
198 | ||
9222097f | 199 | return retval; |
0994375e | 200 | } |
a9427741 | 201 | static DRIVER_ATTR_WO(remove_id); |
0994375e | 202 | |
2229c1fb GKH |
203 | static struct attribute *pci_drv_attrs[] = { |
204 | &driver_attr_new_id.attr, | |
205 | &driver_attr_remove_id.attr, | |
206 | NULL, | |
bfb09a86 | 207 | }; |
2229c1fb | 208 | ATTRIBUTE_GROUPS(pci_drv); |
0994375e | 209 | |
1da177e4 | 210 | /** |
75865858 | 211 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 212 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
213 | * @dev: the PCI device structure to match against. |
214 | * | |
1da177e4 | 215 | * Used by a driver to check whether a PCI device present in the |
75865858 | 216 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 217 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 218 | * |
8b60756a | 219 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 220 | * that a driver might want to check for. |
1da177e4 | 221 | */ |
75865858 GKH |
222 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
223 | struct pci_dev *dev) | |
1da177e4 | 224 | { |
75865858 GKH |
225 | if (ids) { |
226 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
227 | if (pci_match_one_device(ids, dev)) | |
228 | return ids; | |
229 | ids++; | |
230 | } | |
1da177e4 LT |
231 | } |
232 | return NULL; | |
233 | } | |
b7fe9434 | 234 | EXPORT_SYMBOL(pci_match_id); |
1da177e4 | 235 | |
782a985d AW |
236 | static const struct pci_device_id pci_device_id_any = { |
237 | .vendor = PCI_ANY_ID, | |
238 | .device = PCI_ANY_ID, | |
239 | .subvendor = PCI_ANY_ID, | |
240 | .subdevice = PCI_ANY_ID, | |
241 | }; | |
242 | ||
1da177e4 | 243 | /** |
ae9608af | 244 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 245 | * @drv: the PCI driver to match against |
39ba487f | 246 | * @dev: the PCI device structure to match against |
75865858 GKH |
247 | * |
248 | * Used by a driver to check whether a PCI device present in the | |
249 | * system is in its list of supported devices. Returns the matching | |
250 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 251 | */ |
d73460d7 AB |
252 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
253 | struct pci_dev *dev) | |
75865858 | 254 | { |
75865858 | 255 | struct pci_dynid *dynid; |
782a985d AW |
256 | const struct pci_device_id *found_id = NULL; |
257 | ||
258 | /* When driver_override is set, only bind to the matching driver */ | |
259 | if (dev->driver_override && strcmp(dev->driver_override, drv->name)) | |
260 | return NULL; | |
1da177e4 | 261 | |
7461b60a | 262 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
263 | spin_lock(&drv->dynids.lock); |
264 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
265 | if (pci_match_one_device(&dynid->id, dev)) { | |
782a985d AW |
266 | found_id = &dynid->id; |
267 | break; | |
75865858 | 268 | } |
1da177e4 | 269 | } |
75865858 | 270 | spin_unlock(&drv->dynids.lock); |
7461b60a | 271 | |
782a985d AW |
272 | if (!found_id) |
273 | found_id = pci_match_id(drv->id_table, dev); | |
274 | ||
275 | /* driver_override will always match, send a dummy id */ | |
276 | if (!found_id && dev->driver_override) | |
277 | found_id = &pci_device_id_any; | |
278 | ||
279 | return found_id; | |
1da177e4 LT |
280 | } |
281 | ||
873392ca RR |
282 | struct drv_dev_and_id { |
283 | struct pci_driver *drv; | |
284 | struct pci_dev *dev; | |
285 | const struct pci_device_id *id; | |
286 | }; | |
287 | ||
288 | static long local_pci_probe(void *_ddi) | |
289 | { | |
290 | struct drv_dev_and_id *ddi = _ddi; | |
967577b0 HY |
291 | struct pci_dev *pci_dev = ddi->dev; |
292 | struct pci_driver *pci_drv = ddi->drv; | |
293 | struct device *dev = &pci_dev->dev; | |
f3ec4f87 AS |
294 | int rc; |
295 | ||
967577b0 HY |
296 | /* |
297 | * Unbound PCI devices are always put in D0, regardless of | |
298 | * runtime PM status. During probe, the device is set to | |
299 | * active and the usage count is incremented. If the driver | |
a8360062 RW |
300 | * supports runtime PM, it should call pm_runtime_put_noidle(), |
301 | * or any other runtime PM helper function decrementing the usage | |
302 | * count, in its probe routine and pm_runtime_get_noresume() in | |
303 | * its remove routine. | |
f3ec4f87 | 304 | */ |
967577b0 HY |
305 | pm_runtime_get_sync(dev); |
306 | pci_dev->driver = pci_drv; | |
307 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
308 | if (!rc) |
309 | return rc; | |
310 | if (rc < 0) { | |
967577b0 HY |
311 | pci_dev->driver = NULL; |
312 | pm_runtime_put_sync(dev); | |
f92d74c1 | 313 | return rc; |
f3ec4f87 | 314 | } |
f92d74c1 SC |
315 | /* |
316 | * Probe function should return < 0 for failure, 0 for success | |
317 | * Treat values > 0 as success, but warn. | |
318 | */ | |
319 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
320 | return 0; | |
873392ca RR |
321 | } |
322 | ||
0b2c2a71 TG |
323 | static bool pci_physfn_is_probed(struct pci_dev *dev) |
324 | { | |
325 | #ifdef CONFIG_PCI_IOV | |
326 | return dev->is_virtfn && dev->physfn->is_probed; | |
327 | #else | |
328 | return false; | |
329 | #endif | |
330 | } | |
331 | ||
d42c6997 AK |
332 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
333 | const struct pci_device_id *id) | |
334 | { | |
0b2c2a71 | 335 | int error, node, cpu; |
873392ca RR |
336 | struct drv_dev_and_id ddi = { drv, dev, id }; |
337 | ||
12c3156f AD |
338 | /* |
339 | * Execute driver initialization on node where the device is | |
340 | * attached. This way the driver likely allocates its local memory | |
341 | * on the right node. | |
342 | */ | |
873392ca | 343 | node = dev_to_node(&dev->dev); |
0b2c2a71 TG |
344 | dev->is_probed = 1; |
345 | ||
346 | cpu_hotplug_disable(); | |
12c3156f AD |
347 | |
348 | /* | |
0b2c2a71 TG |
349 | * Prevent nesting work_on_cpu() for the case where a Virtual Function |
350 | * device is probed from work_on_cpu() of the Physical device. | |
12c3156f | 351 | */ |
0b2c2a71 TG |
352 | if (node < 0 || node >= MAX_NUMNODES || !node_online(node) || |
353 | pci_physfn_is_probed(dev)) | |
354 | cpu = nr_cpu_ids; | |
355 | else | |
a70f7302 | 356 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
0b2c2a71 TG |
357 | |
358 | if (cpu < nr_cpu_ids) | |
359 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
360 | else | |
873392ca | 361 | error = local_pci_probe(&ddi); |
12c3156f | 362 | |
0b2c2a71 TG |
363 | dev->is_probed = 0; |
364 | cpu_hotplug_enable(); | |
d42c6997 AK |
365 | return error; |
366 | } | |
367 | ||
1da177e4 | 368 | /** |
23ea3793 | 369 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
370 | * @drv: driver to call to check if it wants the PCI device |
371 | * @pci_dev: PCI device being probed | |
f7625980 | 372 | * |
8f7020d3 | 373 | * returns 0 on success, else error. |
1da177e4 LT |
374 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
375 | */ | |
3c78bc61 | 376 | static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
75865858 GKH |
377 | { |
378 | const struct pci_device_id *id; | |
1da177e4 LT |
379 | int error = 0; |
380 | ||
381 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
382 | error = -ENODEV; |
383 | ||
384 | id = pci_match_device(drv, pci_dev); | |
385 | if (id) | |
d42c6997 | 386 | error = pci_call_probe(drv, pci_dev, id); |
1da177e4 LT |
387 | } |
388 | return error; | |
389 | } | |
390 | ||
890e4847 JL |
391 | int __weak pcibios_alloc_irq(struct pci_dev *dev) |
392 | { | |
393 | return 0; | |
394 | } | |
395 | ||
396 | void __weak pcibios_free_irq(struct pci_dev *dev) | |
397 | { | |
398 | } | |
399 | ||
0e7df224 BW |
400 | #ifdef CONFIG_PCI_IOV |
401 | static inline bool pci_device_can_probe(struct pci_dev *pdev) | |
402 | { | |
403 | return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe); | |
404 | } | |
405 | #else | |
406 | static inline bool pci_device_can_probe(struct pci_dev *pdev) | |
407 | { | |
408 | return true; | |
409 | } | |
410 | #endif | |
411 | ||
3c78bc61 | 412 | static int pci_device_probe(struct device *dev) |
1da177e4 | 413 | { |
890e4847 JL |
414 | int error; |
415 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
416 | struct pci_driver *drv = to_pci_driver(dev->driver); | |
417 | ||
30fdfb92 MM |
418 | pci_assign_irq(pci_dev); |
419 | ||
890e4847 JL |
420 | error = pcibios_alloc_irq(pci_dev); |
421 | if (error < 0) | |
422 | return error; | |
1da177e4 | 423 | |
1da177e4 | 424 | pci_dev_get(pci_dev); |
0e7df224 BW |
425 | if (pci_device_can_probe(pci_dev)) { |
426 | error = __pci_device_probe(drv, pci_dev); | |
427 | if (error) { | |
428 | pcibios_free_irq(pci_dev); | |
429 | pci_dev_put(pci_dev); | |
430 | } | |
890e4847 | 431 | } |
1da177e4 LT |
432 | |
433 | return error; | |
434 | } | |
435 | ||
3c78bc61 | 436 | static int pci_device_remove(struct device *dev) |
1da177e4 | 437 | { |
3c78bc61 RD |
438 | struct pci_dev *pci_dev = to_pci_dev(dev); |
439 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
440 | |
441 | if (drv) { | |
f3ec4f87 AS |
442 | if (drv->remove) { |
443 | pm_runtime_get_sync(dev); | |
1da177e4 | 444 | drv->remove(pci_dev); |
f3ec4f87 AS |
445 | pm_runtime_put_noidle(dev); |
446 | } | |
890e4847 | 447 | pcibios_free_irq(pci_dev); |
1da177e4 LT |
448 | pci_dev->driver = NULL; |
449 | } | |
450 | ||
f3ec4f87 | 451 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 452 | pm_runtime_put_sync(dev); |
f3ec4f87 | 453 | |
2449e06a SL |
454 | /* |
455 | * If the device is still on, set the power state as "unknown", | |
456 | * since it might change by the next time we load the driver. | |
457 | */ | |
458 | if (pci_dev->current_state == PCI_D0) | |
459 | pci_dev->current_state = PCI_UNKNOWN; | |
460 | ||
1da177e4 LT |
461 | /* |
462 | * We would love to complain here if pci_dev->is_enabled is set, that | |
463 | * the driver should have called pci_disable_device(), but the | |
464 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 465 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
466 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
467 | * horrible the crap we have to deal with is when we are awake... | |
468 | */ | |
469 | ||
470 | pci_dev_put(pci_dev); | |
471 | return 0; | |
472 | } | |
473 | ||
bbb44d9f RW |
474 | static void pci_device_shutdown(struct device *dev) |
475 | { | |
476 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
477 | struct pci_driver *drv = pci_dev->driver; | |
478 | ||
3ff2de9b HY |
479 | pm_runtime_resume(dev); |
480 | ||
bbb44d9f RW |
481 | if (drv && drv->shutdown) |
482 | drv->shutdown(pci_dev); | |
5b415f1e | 483 | |
b566a22c | 484 | /* |
4fc9bbf9 KA |
485 | * If this is a kexec reboot, turn off Bus Master bit on the |
486 | * device to tell it to not continue to do DMA. Don't touch | |
487 | * devices in D3cold or unknown states. | |
488 | * If it is not a kexec reboot, firmware will hit the PCI | |
489 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 490 | */ |
4fc9bbf9 | 491 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 492 | pci_clear_master(pci_dev); |
bbb44d9f RW |
493 | } |
494 | ||
aa338601 | 495 | #ifdef CONFIG_PM |
6cbf8214 RW |
496 | |
497 | /* Auxiliary functions used for system resume and run-time resume. */ | |
498 | ||
499 | /** | |
500 | * pci_restore_standard_config - restore standard config registers of PCI device | |
501 | * @pci_dev: PCI device to handle | |
502 | */ | |
503 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
504 | { | |
505 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
506 | ||
507 | if (pci_dev->current_state != PCI_D0) { | |
508 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
509 | if (error) | |
510 | return error; | |
511 | } | |
512 | ||
1d3c16a8 | 513 | pci_restore_state(pci_dev); |
0ce3fcaf | 514 | pci_pme_restore(pci_dev); |
1d3c16a8 | 515 | return 0; |
6cbf8214 RW |
516 | } |
517 | ||
db288c9c RW |
518 | #endif |
519 | ||
520 | #ifdef CONFIG_PM_SLEEP | |
521 | ||
6cbf8214 RW |
522 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
523 | { | |
db288c9c RW |
524 | pci_power_up(pci_dev); |
525 | pci_restore_state(pci_dev); | |
0ce3fcaf | 526 | pci_pme_restore(pci_dev); |
6cbf8214 RW |
527 | } |
528 | ||
fa58d305 RW |
529 | /* |
530 | * Default "suspend" method for devices that have no driver provided suspend, | |
531 | * or not even a driver at all (second part). | |
bbb44d9f | 532 | */ |
bb808945 | 533 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 534 | { |
bbb44d9f RW |
535 | /* |
536 | * mark its power state as "unknown", since we don't know if | |
537 | * e.g. the BIOS will change its device state when we suspend. | |
538 | */ | |
539 | if (pci_dev->current_state == PCI_D0) | |
540 | pci_dev->current_state = PCI_UNKNOWN; | |
541 | } | |
542 | ||
355a72d7 RW |
543 | /* |
544 | * Default "resume" method for devices that have no driver provided resume, | |
545 | * or not even a driver at all (second part). | |
546 | */ | |
bb808945 | 547 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
548 | { |
549 | int retval; | |
550 | ||
bbb44d9f RW |
551 | /* if the device was enabled before suspend, reenable */ |
552 | retval = pci_reenable_device(pci_dev); | |
553 | /* | |
554 | * if the device was busmaster before the suspend, make it busmaster | |
555 | * again | |
556 | */ | |
557 | if (pci_dev->is_busmaster) | |
558 | pci_set_master(pci_dev); | |
559 | ||
560 | return retval; | |
561 | } | |
562 | ||
563 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 564 | { |
3c78bc61 RD |
565 | struct pci_dev *pci_dev = to_pci_dev(dev); |
566 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 567 | |
02669492 | 568 | if (drv && drv->suspend) { |
99dadce8 | 569 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 570 | int error; |
aa8c6c93 | 571 | |
57ef8026 FP |
572 | error = drv->suspend(pci_dev, state); |
573 | suspend_report_result(drv->suspend, error); | |
574 | if (error) | |
575 | return error; | |
aa8c6c93 | 576 | |
46939f8b | 577 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
578 | && pci_dev->current_state != PCI_UNKNOWN) { |
579 | WARN_ONCE(pci_dev->current_state != prev, | |
580 | "PCI PM: Device state not saved by %pF\n", | |
581 | drv->suspend); | |
99dadce8 | 582 | } |
02669492 | 583 | } |
ad8cfa1d RW |
584 | |
585 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
586 | ||
46939f8b | 587 | return 0; |
1da177e4 LT |
588 | } |
589 | ||
bbb44d9f | 590 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 591 | { |
3c78bc61 RD |
592 | struct pci_dev *pci_dev = to_pci_dev(dev); |
593 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
594 | |
595 | if (drv && drv->suspend_late) { | |
46939f8b RW |
596 | pci_power_t prev = pci_dev->current_state; |
597 | int error; | |
598 | ||
57ef8026 FP |
599 | error = drv->suspend_late(pci_dev, state); |
600 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
601 | if (error) |
602 | return error; | |
603 | ||
604 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
605 | && pci_dev->current_state != PCI_UNKNOWN) { | |
606 | WARN_ONCE(pci_dev->current_state != prev, | |
607 | "PCI PM: Device state not saved by %pF\n", | |
608 | drv->suspend_late); | |
7d2a01b8 | 609 | goto Fixup; |
46939f8b | 610 | } |
cbd69dbb | 611 | } |
46939f8b RW |
612 | |
613 | if (!pci_dev->state_saved) | |
614 | pci_save_state(pci_dev); | |
615 | ||
616 | pci_pm_set_unknown_state(pci_dev); | |
617 | ||
7d2a01b8 AN |
618 | Fixup: |
619 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
620 | ||
46939f8b | 621 | return 0; |
cbd69dbb | 622 | } |
1da177e4 | 623 | |
f6dc1e5e RW |
624 | static int pci_legacy_resume_early(struct device *dev) |
625 | { | |
3c78bc61 RD |
626 | struct pci_dev *pci_dev = to_pci_dev(dev); |
627 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 628 | |
aa8c6c93 RW |
629 | return drv && drv->resume_early ? |
630 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
631 | } |
632 | ||
bbb44d9f | 633 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 634 | { |
3c78bc61 RD |
635 | struct pci_dev *pci_dev = to_pci_dev(dev); |
636 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 637 | |
ad8cfa1d RW |
638 | pci_fixup_device(pci_fixup_resume, pci_dev); |
639 | ||
aa8c6c93 RW |
640 | return drv && drv->resume ? |
641 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
642 | } |
643 | ||
571ff758 RW |
644 | /* Auxiliary functions used by the new power management framework */ |
645 | ||
5294e256 | 646 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 647 | { |
73410429 | 648 | pci_fixup_device(pci_fixup_resume, pci_dev); |
baecc470 | 649 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
650 | } |
651 | ||
5294e256 | 652 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 653 | { |
5294e256 | 654 | /* Disable non-bridge devices without PM support */ |
326c1cda | 655 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 656 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
657 | } |
658 | ||
07e836e8 RW |
659 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
660 | { | |
661 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 662 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 663 | || drv->resume_early); |
bb808945 RW |
664 | |
665 | /* | |
666 | * Legacy PM support is used by default, so warn if the new framework is | |
667 | * supported as well. Drivers are supposed to support either the | |
668 | * former, or the latter, but not both at the same time. | |
669 | */ | |
82440a82 DF |
670 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
671 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
672 | |
673 | return ret; | |
07e836e8 RW |
674 | } |
675 | ||
571ff758 RW |
676 | /* New power management framework */ |
677 | ||
bbb44d9f RW |
678 | static int pci_pm_prepare(struct device *dev) |
679 | { | |
680 | struct device_driver *drv = dev->driver; | |
bbb44d9f | 681 | |
bac2a909 RW |
682 | if (drv && drv->pm && drv->pm->prepare) { |
683 | int error = drv->pm->prepare(dev); | |
08810a41 | 684 | if (error < 0) |
bac2a909 | 685 | return error; |
08810a41 RW |
686 | |
687 | if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE)) | |
688 | return 0; | |
bac2a909 RW |
689 | } |
690 | return pci_dev_keep_suspended(to_pci_dev(dev)); | |
bbb44d9f RW |
691 | } |
692 | ||
2cef548a RW |
693 | static void pci_pm_complete(struct device *dev) |
694 | { | |
a0d2a959 LW |
695 | struct pci_dev *pci_dev = to_pci_dev(dev); |
696 | ||
697 | pci_dev_complete_resume(pci_dev); | |
698 | pm_generic_complete(dev); | |
699 | ||
700 | /* Resume device if platform firmware has put it in reset-power-on */ | |
d7d80998 | 701 | if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) { |
a0d2a959 LW |
702 | pci_power_t pre_sleep_state = pci_dev->current_state; |
703 | ||
704 | pci_update_current_state(pci_dev, pci_dev->current_state); | |
705 | if (pci_dev->current_state < pre_sleep_state) | |
706 | pm_request_resume(dev); | |
707 | } | |
2cef548a | 708 | } |
bbb44d9f | 709 | |
6cbf8214 RW |
710 | #else /* !CONFIG_PM_SLEEP */ |
711 | ||
712 | #define pci_pm_prepare NULL | |
2cef548a | 713 | #define pci_pm_complete NULL |
6cbf8214 RW |
714 | |
715 | #endif /* !CONFIG_PM_SLEEP */ | |
716 | ||
bbb44d9f RW |
717 | #ifdef CONFIG_SUSPEND |
718 | ||
719 | static int pci_pm_suspend(struct device *dev) | |
720 | { | |
721 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 722 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 723 | |
81f98d30 RW |
724 | pci_dev->skip_bus_pm = false; |
725 | ||
ad8cfa1d RW |
726 | if (pci_has_legacy_pm_support(pci_dev)) |
727 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 728 | |
5294e256 RW |
729 | if (!pm) { |
730 | pci_pm_default_suspend(pci_dev); | |
c4b65157 | 731 | return 0; |
5294e256 RW |
732 | } |
733 | ||
7cd0602d | 734 | /* |
c4b65157 RW |
735 | * PCI devices suspended at run time may need to be resumed at this |
736 | * point, because in general it may be necessary to reconfigure them for | |
737 | * system suspend. Namely, if the device is expected to wake up the | |
738 | * system from the sleep state, it may have to be reconfigured for this | |
739 | * purpose, or if the device is not expected to wake up the system from | |
740 | * the sleep state, it should be prevented from signaling wakeup events | |
741 | * going forward. | |
742 | * | |
743 | * Also if the driver of the device does not indicate that its system | |
744 | * suspend callbacks can cope with runtime-suspended devices, it is | |
745 | * better to resume the device from runtime suspend here. | |
7cd0602d | 746 | */ |
c4b65157 | 747 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
242e23c6 | 748 | !pci_dev_keep_suspended(pci_dev)) { |
c4b65157 | 749 | pm_runtime_resume(dev); |
242e23c6 RW |
750 | pci_dev->state_saved = false; |
751 | } | |
7cd0602d | 752 | |
5294e256 RW |
753 | if (pm->suspend) { |
754 | pci_power_t prev = pci_dev->current_state; | |
755 | int error; | |
756 | ||
ddb7c9d2 RW |
757 | error = pm->suspend(dev); |
758 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
759 | if (error) |
760 | return error; | |
761 | ||
46939f8b | 762 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
763 | && pci_dev->current_state != PCI_UNKNOWN) { |
764 | WARN_ONCE(pci_dev->current_state != prev, | |
765 | "PCI PM: State of device not saved by %pF\n", | |
766 | pm->suspend); | |
5294e256 | 767 | } |
bbb44d9f | 768 | } |
fa58d305 | 769 | |
5294e256 | 770 | return 0; |
bbb44d9f RW |
771 | } |
772 | ||
c4b65157 RW |
773 | static int pci_pm_suspend_late(struct device *dev) |
774 | { | |
775 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
776 | return 0; | |
777 | ||
778 | pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); | |
779 | ||
780 | return pm_generic_suspend_late(dev); | |
781 | } | |
782 | ||
bbb44d9f | 783 | static int pci_pm_suspend_noirq(struct device *dev) |
c8958177 | 784 | { |
355a72d7 | 785 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 786 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 787 | |
d7d80998 RW |
788 | if (dev_pm_smart_suspend_and_suspended(dev)) { |
789 | dev->power.may_skip_resume = true; | |
c4b65157 | 790 | return 0; |
d7d80998 | 791 | } |
c4b65157 | 792 | |
bb808945 RW |
793 | if (pci_has_legacy_pm_support(pci_dev)) |
794 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
795 | ||
931ff68a RW |
796 | if (!pm) { |
797 | pci_save_state(pci_dev); | |
7d2a01b8 | 798 | goto Fixup; |
931ff68a | 799 | } |
46939f8b RW |
800 | |
801 | if (pm->suspend_noirq) { | |
802 | pci_power_t prev = pci_dev->current_state; | |
803 | int error; | |
804 | ||
805 | error = pm->suspend_noirq(dev); | |
806 | suspend_report_result(pm->suspend_noirq, error); | |
807 | if (error) | |
808 | return error; | |
809 | ||
810 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
811 | && pci_dev->current_state != PCI_UNKNOWN) { | |
812 | WARN_ONCE(pci_dev->current_state != prev, | |
813 | "PCI PM: State of device not saved by %pF\n", | |
814 | pm->suspend_noirq); | |
7d2a01b8 | 815 | goto Fixup; |
46939f8b | 816 | } |
bbb44d9f RW |
817 | } |
818 | ||
81f98d30 RW |
819 | if (pci_dev->skip_bus_pm) { |
820 | /* | |
e04ef105 RW |
821 | * Either the device is a bridge with a child in D0 below it, or |
822 | * the function is running for the second time in a row without | |
81f98d30 | 823 | * going through full resume, which is possible only during |
e04ef105 RW |
824 | * suspend-to-idle in a spurious wakeup case. The device should |
825 | * be in D0 at this point, but if it is a bridge, it may be | |
826 | * necessary to save its state. | |
81f98d30 | 827 | */ |
e04ef105 RW |
828 | if (!pci_dev->state_saved) |
829 | pci_save_state(pci_dev); | |
830 | } else if (!pci_dev->state_saved) { | |
46939f8b | 831 | pci_save_state(pci_dev); |
9d26d3a8 | 832 | if (pci_power_manageable(pci_dev)) |
46939f8b RW |
833 | pci_prepare_to_sleep(pci_dev); |
834 | } | |
d67e37d7 | 835 | |
ca67ab5c RW |
836 | dev_dbg(dev, "PCI PM: Suspend power state: %s\n", |
837 | pci_power_name(pci_dev->current_state)); | |
838 | ||
e04ef105 RW |
839 | if (pci_dev->current_state == PCI_D0) { |
840 | pci_dev->skip_bus_pm = true; | |
841 | /* | |
842 | * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any | |
843 | * downstream device is in D0, so avoid changing the power state | |
844 | * of the parent bridge by setting the skip_bus_pm flag for it. | |
845 | */ | |
846 | if (pci_dev->bus->self) | |
847 | pci_dev->bus->self->skip_bus_pm = true; | |
848 | } | |
849 | ||
850 | if (pci_dev->skip_bus_pm && !pm_suspend_via_firmware()) { | |
851 | dev_dbg(dev, "PCI PM: Skipped\n"); | |
852 | goto Fixup; | |
853 | } | |
854 | ||
46939f8b RW |
855 | pci_pm_set_unknown_state(pci_dev); |
856 | ||
dbf0e4c7 AS |
857 | /* |
858 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
859 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
860 | * hasn't been quiesced and tries to turn it off. If the controller | |
861 | * is already in D3, this can hang or cause memory corruption. | |
862 | * | |
863 | * Since the value of the COMMAND register doesn't matter once the | |
864 | * device has been suspended, we can safely set it to 0 here. | |
865 | */ | |
866 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
867 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
868 | ||
7d2a01b8 AN |
869 | Fixup: |
870 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
871 | ||
d7d80998 RW |
872 | /* |
873 | * If the target system sleep state is suspend-to-idle, it is sufficient | |
874 | * to check whether or not the device's wakeup settings are good for | |
875 | * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause | |
876 | * pci_pm_complete() to take care of fixing up the device's state | |
877 | * anyway, if need be. | |
878 | */ | |
879 | dev->power.may_skip_resume = device_may_wakeup(dev) || | |
880 | !device_can_wakeup(dev); | |
881 | ||
46939f8b | 882 | return 0; |
c8958177 | 883 | } |
1da177e4 | 884 | |
f6dc1e5e | 885 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
886 | { |
887 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
888 | struct device_driver *drv = dev->driver; | |
355a72d7 | 889 | int error = 0; |
bbb44d9f | 890 | |
d7d80998 RW |
891 | if (dev_pm_may_skip_resume(dev)) |
892 | return 0; | |
893 | ||
c4b65157 RW |
894 | /* |
895 | * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend | |
896 | * during system suspend, so update their runtime PM status to "active" | |
897 | * as they are going to be put into D0 shortly. | |
898 | */ | |
899 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
900 | pm_runtime_set_active(dev); | |
901 | ||
e04ef105 RW |
902 | /* |
903 | * In the suspend-to-idle case, devices left in D0 during suspend will | |
904 | * stay in D0, so it is not necessary to restore or update their | |
905 | * configuration here and attempting to put them into D0 again may | |
906 | * confuse some firmware, so avoid doing that. | |
907 | */ | |
908 | if (!pci_dev->skip_bus_pm || pm_suspend_via_firmware()) | |
909 | pci_pm_default_resume_early(pci_dev); | |
910 | ||
911 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
aa8c6c93 | 912 | |
ad8cfa1d | 913 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 914 | return pci_legacy_resume_early(dev); |
bb808945 | 915 | |
f6dc1e5e RW |
916 | if (drv && drv->pm && drv->pm->resume_noirq) |
917 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
918 | |
919 | return error; | |
920 | } | |
921 | ||
f6dc1e5e | 922 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 923 | { |
355a72d7 | 924 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 925 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
926 | int error = 0; |
927 | ||
418e4da3 RW |
928 | /* |
929 | * This is necessary for the suspend error path in which resume is | |
930 | * called without restoring the standard config registers of the device. | |
931 | */ | |
932 | if (pci_dev->state_saved) | |
933 | pci_restore_standard_config(pci_dev); | |
934 | ||
ad8cfa1d | 935 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 936 | return pci_legacy_resume(dev); |
bb808945 | 937 | |
5294e256 | 938 | pci_pm_default_resume(pci_dev); |
73410429 | 939 | |
5294e256 RW |
940 | if (pm) { |
941 | if (pm->resume) | |
942 | error = pm->resume(dev); | |
943 | } else { | |
944 | pci_pm_reenable_device(pci_dev); | |
945 | } | |
bbb44d9f | 946 | |
999cce4a | 947 | return error; |
bbb44d9f RW |
948 | } |
949 | ||
950 | #else /* !CONFIG_SUSPEND */ | |
951 | ||
952 | #define pci_pm_suspend NULL | |
c4b65157 | 953 | #define pci_pm_suspend_late NULL |
bbb44d9f RW |
954 | #define pci_pm_suspend_noirq NULL |
955 | #define pci_pm_resume NULL | |
956 | #define pci_pm_resume_noirq NULL | |
957 | ||
958 | #endif /* !CONFIG_SUSPEND */ | |
959 | ||
1f112cee | 960 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 961 | |
699c1985 SO |
962 | |
963 | /* | |
964 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
965 | * a hibernate transition | |
966 | */ | |
967 | struct dev_pm_ops __weak pcibios_pm_ops; | |
968 | ||
bbb44d9f RW |
969 | static int pci_pm_freeze(struct device *dev) |
970 | { | |
971 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 972 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 973 | |
ad8cfa1d RW |
974 | if (pci_has_legacy_pm_support(pci_dev)) |
975 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 976 | |
5294e256 RW |
977 | if (!pm) { |
978 | pci_pm_default_suspend(pci_dev); | |
979 | return 0; | |
bbb44d9f RW |
980 | } |
981 | ||
7cd0602d RW |
982 | /* |
983 | * This used to be done in pci_pm_prepare() for all devices and some | |
984 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
985 | * devices should not be touched during freeze/thaw transitions, | |
986 | * however. | |
987 | */ | |
bd5a9802 | 988 | if (!dev_pm_smart_suspend_and_suspended(dev)) { |
c4b65157 | 989 | pm_runtime_resume(dev); |
bd5a9802 MW |
990 | pci_dev->state_saved = false; |
991 | } | |
7cd0602d | 992 | |
5294e256 RW |
993 | if (pm->freeze) { |
994 | int error; | |
995 | ||
996 | error = pm->freeze(dev); | |
997 | suspend_report_result(pm->freeze, error); | |
998 | if (error) | |
999 | return error; | |
1000 | } | |
1001 | ||
5294e256 | 1002 | return 0; |
bbb44d9f RW |
1003 | } |
1004 | ||
c4b65157 RW |
1005 | static int pci_pm_freeze_late(struct device *dev) |
1006 | { | |
1007 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1008 | return 0; | |
1009 | ||
1010 | return pm_generic_freeze_late(dev);; | |
1011 | } | |
1012 | ||
bbb44d9f RW |
1013 | static int pci_pm_freeze_noirq(struct device *dev) |
1014 | { | |
355a72d7 | 1015 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1016 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1017 | |
c4b65157 RW |
1018 | if (dev_pm_smart_suspend_and_suspended(dev)) |
1019 | return 0; | |
1020 | ||
bb808945 RW |
1021 | if (pci_has_legacy_pm_support(pci_dev)) |
1022 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
1023 | ||
d67e37d7 | 1024 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
1025 | int error; |
1026 | ||
d67e37d7 RW |
1027 | error = drv->pm->freeze_noirq(dev); |
1028 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
1029 | if (error) |
1030 | return error; | |
bbb44d9f RW |
1031 | } |
1032 | ||
46939f8b RW |
1033 | if (!pci_dev->state_saved) |
1034 | pci_save_state(pci_dev); | |
d67e37d7 | 1035 | |
46939f8b RW |
1036 | pci_pm_set_unknown_state(pci_dev); |
1037 | ||
699c1985 SO |
1038 | if (pcibios_pm_ops.freeze_noirq) |
1039 | return pcibios_pm_ops.freeze_noirq(dev); | |
1040 | ||
46939f8b | 1041 | return 0; |
bbb44d9f RW |
1042 | } |
1043 | ||
f6dc1e5e | 1044 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 1045 | { |
355a72d7 | 1046 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
1047 | struct device_driver *drv = dev->driver; |
1048 | int error = 0; | |
1049 | ||
c4b65157 RW |
1050 | /* |
1051 | * If the device is in runtime suspend, the code below may not work | |
1052 | * correctly with it, so skip that code and make the PM core skip all of | |
1053 | * the subsequent "thaw" callbacks for the device. | |
1054 | */ | |
1055 | if (dev_pm_smart_suspend_and_suspended(dev)) { | |
3487972d | 1056 | dev_pm_skip_next_resume_phases(dev); |
c4b65157 RW |
1057 | return 0; |
1058 | } | |
1059 | ||
699c1985 SO |
1060 | if (pcibios_pm_ops.thaw_noirq) { |
1061 | error = pcibios_pm_ops.thaw_noirq(dev); | |
1062 | if (error) | |
1063 | return error; | |
1064 | } | |
1065 | ||
ad8cfa1d | 1066 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1067 | return pci_legacy_resume_early(dev); |
bb808945 | 1068 | |
5839ee73 RW |
1069 | /* |
1070 | * pci_restore_state() requires the device to be in D0 (because of MSI | |
1071 | * restoration among other things), so force it into D0 in case the | |
1072 | * driver's "freeze" callbacks put it into a low-power state directly. | |
1073 | */ | |
1074 | pci_set_power_state(pci_dev, PCI_D0); | |
e60514bd | 1075 | pci_restore_state(pci_dev); |
d67e37d7 | 1076 | |
f6dc1e5e RW |
1077 | if (drv && drv->pm && drv->pm->thaw_noirq) |
1078 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
1079 | |
1080 | return error; | |
1081 | } | |
1082 | ||
f6dc1e5e | 1083 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 1084 | { |
355a72d7 | 1085 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 1086 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1087 | int error = 0; |
1088 | ||
ad8cfa1d | 1089 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1090 | return pci_legacy_resume(dev); |
bb808945 | 1091 | |
5294e256 RW |
1092 | if (pm) { |
1093 | if (pm->thaw) | |
1094 | error = pm->thaw(dev); | |
1095 | } else { | |
1096 | pci_pm_reenable_device(pci_dev); | |
1097 | } | |
bbb44d9f | 1098 | |
4b77b0a2 RW |
1099 | pci_dev->state_saved = false; |
1100 | ||
bbb44d9f RW |
1101 | return error; |
1102 | } | |
1103 | ||
1104 | static int pci_pm_poweroff(struct device *dev) | |
1105 | { | |
355a72d7 | 1106 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 1107 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 1108 | |
ad8cfa1d RW |
1109 | if (pci_has_legacy_pm_support(pci_dev)) |
1110 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 1111 | |
5294e256 RW |
1112 | if (!pm) { |
1113 | pci_pm_default_suspend(pci_dev); | |
c4b65157 | 1114 | return 0; |
5294e256 RW |
1115 | } |
1116 | ||
7cd0602d | 1117 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
c4b65157 RW |
1118 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
1119 | !pci_dev_keep_suspended(pci_dev)) | |
1120 | pm_runtime_resume(dev); | |
7cd0602d | 1121 | |
82fee4d6 | 1122 | pci_dev->state_saved = false; |
5294e256 | 1123 | if (pm->poweroff) { |
46939f8b RW |
1124 | int error; |
1125 | ||
ddb7c9d2 RW |
1126 | error = pm->poweroff(dev); |
1127 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
1128 | if (error) |
1129 | return error; | |
bbb44d9f RW |
1130 | } |
1131 | ||
46939f8b | 1132 | return 0; |
bbb44d9f | 1133 | } |
c9b9972b | 1134 | |
c4b65157 RW |
1135 | static int pci_pm_poweroff_late(struct device *dev) |
1136 | { | |
1137 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1138 | return 0; | |
699c1985 | 1139 | |
c4b65157 RW |
1140 | pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); |
1141 | ||
1142 | return pm_generic_poweroff_late(dev); | |
bbb44d9f RW |
1143 | } |
1144 | ||
1145 | static int pci_pm_poweroff_noirq(struct device *dev) | |
1146 | { | |
46939f8b | 1147 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1148 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1149 | |
c4b65157 RW |
1150 | if (dev_pm_smart_suspend_and_suspended(dev)) |
1151 | return 0; | |
1152 | ||
bb808945 RW |
1153 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1154 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1155 | ||
7d2a01b8 AN |
1156 | if (!drv || !drv->pm) { |
1157 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1158 | return 0; |
7d2a01b8 | 1159 | } |
46939f8b RW |
1160 | |
1161 | if (drv->pm->poweroff_noirq) { | |
1162 | int error; | |
1163 | ||
d67e37d7 RW |
1164 | error = drv->pm->poweroff_noirq(dev); |
1165 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1166 | if (error) |
1167 | return error; | |
bbb44d9f RW |
1168 | } |
1169 | ||
326c1cda | 1170 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1171 | pci_prepare_to_sleep(pci_dev); |
1172 | ||
0b68c8e2 RW |
1173 | /* |
1174 | * The reason for doing this here is the same as for the analogous code | |
1175 | * in pci_pm_suspend_noirq(). | |
1176 | */ | |
1177 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1178 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1179 | ||
7d2a01b8 AN |
1180 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1181 | ||
699c1985 SO |
1182 | if (pcibios_pm_ops.poweroff_noirq) |
1183 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1184 | ||
46939f8b | 1185 | return 0; |
bbb44d9f RW |
1186 | } |
1187 | ||
f6dc1e5e | 1188 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1189 | { |
1190 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1191 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1192 | int error = 0; |
bbb44d9f | 1193 | |
c4b65157 RW |
1194 | /* This is analogous to the pci_pm_resume_noirq() case. */ |
1195 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1196 | pm_runtime_set_active(dev); | |
1197 | ||
699c1985 SO |
1198 | if (pcibios_pm_ops.restore_noirq) { |
1199 | error = pcibios_pm_ops.restore_noirq(dev); | |
1200 | if (error) | |
1201 | return error; | |
1202 | } | |
1203 | ||
6cbf8214 | 1204 | pci_pm_default_resume_early(pci_dev); |
e04ef105 | 1205 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
aa8c6c93 | 1206 | |
ad8cfa1d | 1207 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1208 | return pci_legacy_resume_early(dev); |
bb808945 | 1209 | |
f6dc1e5e RW |
1210 | if (drv && drv->pm && drv->pm->restore_noirq) |
1211 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1212 | |
1213 | return error; | |
1214 | } | |
1215 | ||
f6dc1e5e | 1216 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1217 | { |
1218 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1219 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1220 | int error = 0; |
1221 | ||
418e4da3 RW |
1222 | /* |
1223 | * This is necessary for the hibernation error path in which restore is | |
1224 | * called without restoring the standard config registers of the device. | |
1225 | */ | |
1226 | if (pci_dev->state_saved) | |
1227 | pci_restore_standard_config(pci_dev); | |
1228 | ||
ad8cfa1d | 1229 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1230 | return pci_legacy_resume(dev); |
bb808945 | 1231 | |
5294e256 | 1232 | pci_pm_default_resume(pci_dev); |
73410429 | 1233 | |
5294e256 RW |
1234 | if (pm) { |
1235 | if (pm->restore) | |
1236 | error = pm->restore(dev); | |
1237 | } else { | |
1238 | pci_pm_reenable_device(pci_dev); | |
1239 | } | |
bbb44d9f RW |
1240 | |
1241 | return error; | |
c8958177 | 1242 | } |
1da177e4 | 1243 | |
1f112cee | 1244 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1245 | |
1246 | #define pci_pm_freeze NULL | |
c4b65157 | 1247 | #define pci_pm_freeze_late NULL |
bbb44d9f RW |
1248 | #define pci_pm_freeze_noirq NULL |
1249 | #define pci_pm_thaw NULL | |
1250 | #define pci_pm_thaw_noirq NULL | |
1251 | #define pci_pm_poweroff NULL | |
c4b65157 | 1252 | #define pci_pm_poweroff_late NULL |
bbb44d9f RW |
1253 | #define pci_pm_poweroff_noirq NULL |
1254 | #define pci_pm_restore NULL | |
1255 | #define pci_pm_restore_noirq NULL | |
1256 | ||
1f112cee | 1257 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1258 | |
fbb988be | 1259 | #ifdef CONFIG_PM |
6cbf8214 RW |
1260 | |
1261 | static int pci_pm_runtime_suspend(struct device *dev) | |
1262 | { | |
1263 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1264 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1265 | pci_power_t prev = pci_dev->current_state; | |
1266 | int error; | |
1267 | ||
967577b0 | 1268 | /* |
3cf160f5 RW |
1269 | * If pci_dev->driver is not set (unbound), we leave the device in D0, |
1270 | * but it may go to D3cold when the bridge above it runtime suspends. | |
1271 | * Save its config space in case that happens. | |
967577b0 | 1272 | */ |
3cf160f5 RW |
1273 | if (!pci_dev->driver) { |
1274 | pci_save_state(pci_dev); | |
967577b0 | 1275 | return 0; |
3cf160f5 | 1276 | } |
967577b0 | 1277 | |
6cbf8214 RW |
1278 | if (!pm || !pm->runtime_suspend) |
1279 | return -ENOSYS; | |
1280 | ||
82fee4d6 | 1281 | pci_dev->state_saved = false; |
6cbf8214 | 1282 | error = pm->runtime_suspend(dev); |
06bf403d ID |
1283 | if (error) { |
1284 | /* | |
1285 | * -EBUSY and -EAGAIN is used to request the runtime PM core | |
1286 | * to schedule a new suspend, so log the event only with debug | |
1287 | * log level. | |
1288 | */ | |
1289 | if (error == -EBUSY || error == -EAGAIN) | |
1290 | dev_dbg(dev, "can't suspend now (%pf returned %d)\n", | |
1291 | pm->runtime_suspend, error); | |
1292 | else | |
1293 | dev_err(dev, "can't suspend (%pf returned %d)\n", | |
1294 | pm->runtime_suspend, error); | |
1295 | ||
6cbf8214 | 1296 | return error; |
06bf403d | 1297 | } |
6cbf8214 RW |
1298 | |
1299 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1300 | ||
1301 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1302 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1303 | WARN_ONCE(pci_dev->current_state != prev, | |
1304 | "PCI PM: State of device not saved by %pF\n", | |
1305 | pm->runtime_suspend); | |
1306 | return 0; | |
1307 | } | |
1308 | ||
42eca230 | 1309 | if (!pci_dev->state_saved) { |
6cbf8214 | 1310 | pci_save_state(pci_dev); |
42eca230 DA |
1311 | pci_finish_runtime_suspend(pci_dev); |
1312 | } | |
6cbf8214 RW |
1313 | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | static int pci_pm_runtime_resume(struct device *dev) | |
1318 | { | |
448bd857 | 1319 | int rc; |
6cbf8214 RW |
1320 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1321 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1322 | ||
967577b0 | 1323 | /* |
3cf160f5 RW |
1324 | * Restoring config space is necessary even if the device is not bound |
1325 | * to a driver because although we left it in D0, it may have gone to | |
1326 | * D3cold when the bridge above it runtime suspended. | |
967577b0 | 1327 | */ |
3cf160f5 RW |
1328 | pci_restore_standard_config(pci_dev); |
1329 | ||
967577b0 HY |
1330 | if (!pci_dev->driver) |
1331 | return 0; | |
1332 | ||
6cbf8214 RW |
1333 | if (!pm || !pm->runtime_resume) |
1334 | return -ENOSYS; | |
1335 | ||
db288c9c | 1336 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
0847684c | 1337 | pci_enable_wake(pci_dev, PCI_D0, false); |
6cbf8214 RW |
1338 | pci_fixup_device(pci_fixup_resume, pci_dev); |
1339 | ||
448bd857 HY |
1340 | rc = pm->runtime_resume(dev); |
1341 | ||
1342 | pci_dev->runtime_d3cold = false; | |
1343 | ||
1344 | return rc; | |
6cbf8214 RW |
1345 | } |
1346 | ||
1347 | static int pci_pm_runtime_idle(struct device *dev) | |
1348 | { | |
967577b0 | 1349 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1350 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1351 | int ret = 0; |
6cbf8214 | 1352 | |
967577b0 HY |
1353 | /* |
1354 | * If pci_dev->driver is not set (unbound), the device should | |
1355 | * always remain in D0 regardless of the runtime PM status | |
1356 | */ | |
1357 | if (!pci_dev->driver) | |
45f0a85c | 1358 | return 0; |
967577b0 | 1359 | |
6cbf8214 RW |
1360 | if (!pm) |
1361 | return -ENOSYS; | |
1362 | ||
45f0a85c RW |
1363 | if (pm->runtime_idle) |
1364 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1365 | |
45f0a85c | 1366 | return ret; |
6cbf8214 RW |
1367 | } |
1368 | ||
f91da04d | 1369 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1370 | .prepare = pci_pm_prepare, |
2cef548a | 1371 | .complete = pci_pm_complete, |
adf09493 | 1372 | .suspend = pci_pm_suspend, |
c4b65157 | 1373 | .suspend_late = pci_pm_suspend_late, |
adf09493 RW |
1374 | .resume = pci_pm_resume, |
1375 | .freeze = pci_pm_freeze, | |
c4b65157 | 1376 | .freeze_late = pci_pm_freeze_late, |
adf09493 RW |
1377 | .thaw = pci_pm_thaw, |
1378 | .poweroff = pci_pm_poweroff, | |
c4b65157 | 1379 | .poweroff_late = pci_pm_poweroff_late, |
adf09493 | 1380 | .restore = pci_pm_restore, |
bbb44d9f RW |
1381 | .suspend_noirq = pci_pm_suspend_noirq, |
1382 | .resume_noirq = pci_pm_resume_noirq, | |
1383 | .freeze_noirq = pci_pm_freeze_noirq, | |
1384 | .thaw_noirq = pci_pm_thaw_noirq, | |
1385 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1386 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1387 | .runtime_suspend = pci_pm_runtime_suspend, |
1388 | .runtime_resume = pci_pm_runtime_resume, | |
1389 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1390 | }; |
1391 | ||
adf09493 | 1392 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1393 | |
fbb988be RW |
1394 | #else /* !CONFIG_PM */ |
1395 | ||
1396 | #define pci_pm_runtime_suspend NULL | |
1397 | #define pci_pm_runtime_resume NULL | |
1398 | #define pci_pm_runtime_idle NULL | |
bbb44d9f RW |
1399 | |
1400 | #define PCI_PM_OPS_PTR NULL | |
1401 | ||
fbb988be | 1402 | #endif /* !CONFIG_PM */ |
bbb44d9f | 1403 | |
1da177e4 | 1404 | /** |
863b18f4 | 1405 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1406 | * @drv: the driver structure to register |
863b18f4 | 1407 | * @owner: owner module of drv |
f95d882d | 1408 | * @mod_name: module name string |
f7625980 | 1409 | * |
1da177e4 | 1410 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1411 | * Returns a negative value on error, otherwise 0. |
1412 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1413 | * no device was claimed during registration. |
1414 | */ | |
725522b5 GKH |
1415 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1416 | const char *mod_name) | |
1da177e4 | 1417 | { |
1da177e4 LT |
1418 | /* initialize common driver fields */ |
1419 | drv->driver.name = drv->name; | |
1420 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1421 | drv->driver.owner = owner; |
725522b5 | 1422 | drv->driver.mod_name = mod_name; |
92d50fc1 | 1423 | drv->driver.groups = drv->groups; |
50b00755 | 1424 | |
75865858 GKH |
1425 | spin_lock_init(&drv->dynids.lock); |
1426 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1427 | |
1428 | /* register with core */ | |
bfb09a86 | 1429 | return driver_register(&drv->driver); |
1da177e4 | 1430 | } |
b7fe9434 | 1431 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1432 | |
1433 | /** | |
1434 | * pci_unregister_driver - unregister a pci driver | |
1435 | * @drv: the driver structure to unregister | |
f7625980 | 1436 | * |
1da177e4 LT |
1437 | * Deletes the driver structure from the list of registered PCI drivers, |
1438 | * gives it a chance to clean up by calling its remove() function for | |
1439 | * each device it was responsible for, and marks those devices as | |
1440 | * driverless. | |
1441 | */ | |
1442 | ||
3c78bc61 | 1443 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1444 | { |
1445 | driver_unregister(&drv->driver); | |
1446 | pci_free_dynids(drv); | |
1447 | } | |
b7fe9434 | 1448 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1449 | |
1450 | static struct pci_driver pci_compat_driver = { | |
1451 | .name = "compat" | |
1452 | }; | |
1453 | ||
1454 | /** | |
1455 | * pci_dev_driver - get the pci_driver of a device | |
1456 | * @dev: the device to query | |
1457 | * | |
f7625980 | 1458 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1459 | * registered driver for the device. |
1460 | */ | |
3c78bc61 | 1461 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1462 | { |
1463 | if (dev->driver) | |
1464 | return dev->driver; | |
1465 | else { | |
1466 | int i; | |
3c78bc61 | 1467 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1468 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1469 | return &pci_compat_driver; | |
1470 | } | |
1471 | return NULL; | |
1472 | } | |
b7fe9434 | 1473 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1474 | |
1475 | /** | |
1476 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1477 | * @dev: the PCI device structure to match against |
8f7020d3 | 1478 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1479 | * |
1da177e4 | 1480 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1481 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1482 | * pci_device_id structure or %NULL if there is no match. |
1483 | */ | |
75865858 | 1484 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1485 | { |
75865858 | 1486 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1487 | struct pci_driver *pci_drv; |
1da177e4 LT |
1488 | const struct pci_device_id *found_id; |
1489 | ||
58d9a38f YL |
1490 | if (!pci_dev->match_driver) |
1491 | return 0; | |
1492 | ||
1493 | pci_drv = to_pci_driver(drv); | |
75865858 | 1494 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1495 | if (found_id) |
1496 | return 1; | |
1497 | ||
75865858 | 1498 | return 0; |
1da177e4 LT |
1499 | } |
1500 | ||
1501 | /** | |
1502 | * pci_dev_get - increments the reference count of the pci device structure | |
1503 | * @dev: the device being referenced | |
1504 | * | |
1505 | * Each live reference to a device should be refcounted. | |
1506 | * | |
1507 | * Drivers for PCI devices should normally record such references in | |
1508 | * their probe() methods, when they bind to a device, and release | |
1509 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1510 | * | |
1511 | * A pointer to the device with the incremented reference counter is returned. | |
1512 | */ | |
1513 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1514 | { | |
1515 | if (dev) | |
1516 | get_device(&dev->dev); | |
1517 | return dev; | |
1518 | } | |
b7fe9434 | 1519 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1520 | |
1521 | /** | |
1522 | * pci_dev_put - release a use of the pci device structure | |
1523 | * @dev: device that's been disconnected | |
1524 | * | |
1525 | * Must be called when a user of a device is finished with it. When the last | |
1526 | * user of the device calls this function, the memory of the device is freed. | |
1527 | */ | |
1528 | void pci_dev_put(struct pci_dev *dev) | |
1529 | { | |
1530 | if (dev) | |
1531 | put_device(&dev->dev); | |
1532 | } | |
b7fe9434 | 1533 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1534 | |
8ccc9aa1 BP |
1535 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1536 | { | |
1537 | struct pci_dev *pdev; | |
1538 | ||
1539 | if (!dev) | |
1540 | return -ENODEV; | |
1541 | ||
1542 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1543 | |
1544 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1545 | return -ENOMEM; | |
1546 | ||
1547 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1548 | return -ENOMEM; | |
1549 | ||
1550 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1551 | pdev->subsystem_device)) | |
1552 | return -ENOMEM; | |
1553 | ||
1554 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1555 | return -ENOMEM; | |
1556 | ||
145b3fe5 | 1557 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X", |
8ccc9aa1 BP |
1558 | pdev->vendor, pdev->device, |
1559 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1560 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1561 | (u8)(pdev->class))) | |
1562 | return -ENOMEM; | |
efdd4070 | 1563 | |
8ccc9aa1 BP |
1564 | return 0; |
1565 | } | |
1566 | ||
02e0bea6 PS |
1567 | static int pci_bus_num_vf(struct device *dev) |
1568 | { | |
1569 | return pci_num_vf(to_pci_dev(dev)); | |
1570 | } | |
1571 | ||
1da177e4 LT |
1572 | struct bus_type pci_bus_type = { |
1573 | .name = "pci", | |
1574 | .match = pci_bus_match, | |
312c004d | 1575 | .uevent = pci_uevent, |
b15d686a RK |
1576 | .probe = pci_device_probe, |
1577 | .remove = pci_device_remove, | |
cbd69dbb | 1578 | .shutdown = pci_device_shutdown, |
5136b2da | 1579 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1580 | .bus_groups = pci_bus_groups, |
2229c1fb | 1581 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1582 | .pm = PCI_PM_OPS_PTR, |
02e0bea6 | 1583 | .num_vf = pci_bus_num_vf, |
d89e2378 | 1584 | .force_dma = true, |
1da177e4 | 1585 | }; |
b7fe9434 | 1586 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 LT |
1587 | |
1588 | static int __init pci_driver_init(void) | |
1589 | { | |
1590 | return bus_register(&pci_bus_type); | |
1591 | } | |
1da177e4 | 1592 | postcore_initcall(pci_driver_init); |